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Strawberry

Diseases Before Flowering

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  • Angular leaf spot
  • Anthracnose
  • Common leaf spot
  • Leaf blotch
  • Phytopthora crown rot
  • Red stele root rot
  • Powdery mildew

Look for these diseases when monitoring fields for spider mites. Flag locations with problems so you can follow up with more monitoring or control action. Names link to more information on identification and management.

Click on photos to enlarge

Angular leaf spot lesions
Angular leaf spot lesions
Identification tip: Watersoaked lesions on underside of leaf, delimited by leaf veins; dark, viscous fluid on surface of lesions.

Angular leaf spot coalesced lesions
Angular leaf spot coalesced lesions
Identification tip: Reddish brown spots and patches on upper leaf surface.

 

Anthracnose runner lesions
Anthracnose runner lesions
Identification tip: Sunken, dark brown lesions on stems, runners, leaf petioles.

Anthracnose damaged plant
Anthracnose damaged plant
Identification tip: Wilted, collapsed plants.

Anthracnose crown discoloration
Anthracnose crown discoloration
Identification tip: Red-brown discoloration in crown tissue of wilted plants.

 Common leaf spot lesions
Common leaf spot lesions Identification tip: Leaf spots with light brown centers and dark brown margins.

Common leaf spot coalesced lesions
Common leaf spot coalesced lesions
Identification tip: Multiple leaf spots converge into dark patches; leaves may be killed.

Leaf blotch lesion
Leaf blotch lesion
Identification tip: Tan or light brown patches at leaf margins; numerous dark brown dots in the discolored areas.

Phytopthora crown rot
Phytopthora crown rot damage
Identification tip: Wilted, dying plants.

Phytophthora crown rot
Phytophthora crown rot
Identification tip: Brown discoloration of crown tissue.

Red stele root rot
Red stele root rot
Identification tip: Roots rotted back from tip; reddish brown discoloration of central conducting tissue above rotted portion.

Botrtis R
Powdery mildew damage
Identification tip: Leaf edges curled upward; purple discoloration of leaf margins.

Powdery mildew sporulatoin
Powdery mildew sporulation
Identification tip: Powdery white patches on underside of leaves .

 

 

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